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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f055c08c4e4264fd0cb8fe671289ca07eb243b1bad7f7bd867aa7bd5e266918c' 
  AND token = 'KD9Tl3YfDQ0ykdtNFih9OPWRy03j1i+E37cQGgT+j3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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