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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b99abacc75419959c36d804b772df37ad7934b271cc99e05d3a7b2a85527309' 
  AND token = '58rNEqh8QIJ5/FtHaxz3H+sgeWT738pqpyK/DGxKjDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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