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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8621b850db13c6c62d9b74d1d4cc1b1a8fe22a15d9b6824061a0d36b6325fa' 
  AND token = 'y93F5eYggRNA62Ifg6SIFHdR33/kZLiOAe4V+gBv6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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