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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712aa2f9c32f7049f3566dcc80273f9d7eb5a632f4b7cabda9d95ecf18c131f6' 
  AND token = '0DUg4cg6BEiA/S9SW81aCNiHlGF9NmCFfxdN5DNq714=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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