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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353e46bb95f5760a2c18d98f43f70595f2118bd7f0128e75bf148ed5c602d750' 
  AND token = 'Ky+lyNt8C43zs0ek8Fwl4pc8E6xEdjp2Ww6nVRqOxxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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