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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad351bdc81a46b8660403e946ed982d65a7a87ebd79610358cc09829b687483a' 
  AND token = 'hkus6DZ1E7WZIl5qEu43PCBiz9nMbRtL/jr0zJIwoFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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