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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093def092db5bc853ab36d6b480f5626034709fe7d9fd633740f5a86107f298c' 
  AND token = 'jXjCYLTN7qWaHpQaggWZm6jJ/A4NoAYERQRAr7pU9UA=' 
  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"
    }
  }
}