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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3012ac7cad979f13528818f160c60d981f1375997127904d8c671dca05fb407b' 
  AND token = 'G6AQ/pTrWgfzYZ83J0i/cOTc0qsZVEqAztE3e4FJgjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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