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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31296dfef191c3bdd168213d86385561e24991df08b269d70346981b92a31159' 
  AND token = 'W3QKZ6hn6fKgVy6qC7evHAT9pLclini3xHbJzXDeIoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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