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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fb01b83fdcc36fda928b0fd90e85ae75c335d27b8df6f2d13a30e41065cc89' 
  AND token = '6k+nB239oS0XFSOVQAMMyTDoTxSng6Yus+wKqwvfjNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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