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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd022cb5b8957ab0dabc6243a44dc247e404286db0accb7572ec90bd810241181' 
  AND token = 'rCO6OAgZ2RoogfedYcvef1/nlr9uYvVEG6rCxUuhXzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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