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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fd0eb2d06b757100f32a3dd5062ada1802a83d8d25694e98c8459938a6f552' 
  AND token = 'DLKSSl/PM/uuKaBDH8m7MVonKNexCNfZHLXbeqaskew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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