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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c296c20d2c36ed7573769659a5c6c007f569350e2656dd4a5098b1670073dec' 
  AND token = 'PNrT+ltkKDNxtGsICWunjrQWwcYpkVSMAjNQkOociEs=' 
  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"
    }
  }
}