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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faab10ce39f9c846d9c9cd38ff277e0672b323ec38a29e032597adbf1e3f6155' 
  AND token = 'Djd4IYAcOBfS496R7Zww4o89RdwTnNbhpwjIw9C3i5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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