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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44d0713c27d6d7fe05ec495b4c02c996b5f3faa81d068a341dd36e1075df83c' 
  AND token = 'hFBxKdNy8X9QFEqqnMa1ieFGTveKavAq/neLsCRu/gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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