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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b708ce12a27e59bebc0bd1c947d887d9a8b7b4b3a7a6ba34defd315c3542d8' 
  AND token = 'bfN1szZoS4WC6AhSwUBsbHj8Xtt5yW99G+7fXIYGKa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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