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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4abaacb41f4e7e570e5d45cd1feac9a1e466b167c4ccc6800732adfe5255414' 
  AND token = 'on7RJz3jbfevP7//u1Hbkdws2r8teYF23kakfGPjw4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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