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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b1d658b829e64b179b43c849f72c2a28d48ffd6eb030709ca3776f84f8ab82' 
  AND token = 'kTdEBuS88ih9H/aA5YmYs89XxMJ63qm3kxnj4k+I6/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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