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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190e971ee69127d4fa8681aba3e52515cbacb2756d8ceb8932a69e4f4eea7b9d' 
  AND token = 'J9y3zv3gHNF8hd5rfeFN1drstXzaGidLqrGVo/ctTJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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