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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a997749e6b77b1c48f19df9b77dfc9575084a986bfd0e6aad77ec05d5c77f2' 
  AND token = 'VvwsaE9r1pKOdgP5L7QliUMkilVenjKTPvGUYcWu2gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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