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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95639629e85059ae34f02182a22721dfeb871f386fe42857a3054ae73f5dde9d' 
  AND token = 'QnfUQNXWd4+addfEHdIW2j9+hta6p1u8mrMA2TBHWq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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