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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f91144304af6cb54ee941223f3c36fbb0833e686c5323ab1df118178422207f' 
  AND token = 'RJ6vSZ0VoCmdE5XSF+ZMkHbifE0O4o1n6ydi8pth3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}