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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a4b121f016345d030553faa5e982304d627779c0ae16cc7c119a6ba7db6e0f' 
  AND token = 'yfBjFurODZYkn5t/PWSyH4d2w7CqtttYsiRmVMmkM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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