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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c67fa7a1ec605ce9b9bb22394fc026330bbf276ae86b82fc9e34c26f3ece08' 
  AND token = 'jC4JFKisYxZHJRANb0qHXCH3/BIRRAys03y3nUdMpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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