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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a576b9e04140ecb10c18b01dc68eda575cb2950074afc07eadda96583687bdc' 
  AND token = '6CApJvG4/Jmm8jEjuhGbeU78QW/fTQ2ETCUHc1v4Xow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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