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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199976e29856bf5f9c076f4f0f944f39b7c51f829cd1f4ad8c8be86d20495df1' 
  AND token = 'tMvq/EiyKivklY+KRj50Db18A5tMhPp+CJhknzSHeC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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