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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a12033427d3f9f7272f997f747c4bae6345d03310461f4347468a331c2c854' 
  AND token = 'TboXIT4dahRt7CKGDxi+fnNs1TosJY/p1hR7qu6M8r0=' 
  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"
    }
  }
}