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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9ef39f0e095ea5107bbe70ccda1a12fc80b4e4c2fb44cc7833fe34f2510225' 
  AND token = 'fZBU9W70F8yQGk8H3sM0y84363XxV2oDzwrncojG8hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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