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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538609a640bc26abb40df12561e7d1eb0997665b7a585f883210541c279dd07c' 
  AND token = 'gyN2wWF26U8FHy+adA8J4g7q2wckNcKe21XaVo6WqhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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