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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4512e5e9728b90dbe511fdd6b5c12484ebacfebeb8b288cb2009923fe47830' 
  AND token = 'ir6BrkqFCLEtO2XAHUysr/oYOYz/oPsXwTvhDSN698g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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