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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114cb1e02d0f160e4177b6696fec527f4c9f1932d940f49c0aade27c0e3bb501' 
  AND token = '3eHELFi4wAQYDmWnjRgVgSDtkeTZMAgjwidFT8HH28s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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