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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8760ea7e66101f6da9f1a1a04b8777ddd65fb13a3adff55d40264edd5f4c25' 
  AND token = 'Pzz4YGB2Zetq1Ux0D836/RPk+3WTkpIkG99uyiIZXPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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