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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fad3aa01d320ba3e74ab6448eee6cfba7f4bdb2f14502bec57eaf77212c8451' 
  AND token = 'rYrQZ/lKar+SsmvTuo9IjWGe4I6xDN5URnr0rO0GM9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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