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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a9e883ca0cdc6c43789eb66a789fd150d9cfc84c73440fea67ab7fa8fa2abb' 
  AND token = 'CgTWCmwcp0rh2dlTQkwyQUx4WY95m7HzeO0eH6kNg0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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