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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2d225a12fba1df28bbb3347252bdd6bbebd9f766fa75a65fd2abede5800d78' 
  AND token = '0xk1L9xlaoQjR94iQGitt90j5Ir9gw4jnGrnO+eEsgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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