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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5f20b188fdd711532b3692b8e102918d4e93a30de5901278d50c13b2d3b391' 
  AND token = 'K0Dtzzl2g7NJekKf3rZ7aPvjHB6v/WLl3suF7M3ScRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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