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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d66fbed33091b9c8c94602b4700ddb4bc139d1304106bbd73dc87cb69c647c' 
  AND token = 'hM+kYj6myHPRHqHTZRkr3QNZCsZkB1BVUh/V/4NUPT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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