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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5de3dbb0025d593aacbd0e8079027e66492762035daf900579da1a4d1ea5641' 
  AND token = 'CsV4x5iw8rFU0BQ2FehaU3mFimr00gnFfLjU4XPJmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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