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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdb6f77f9656324b1e2cd528893ee714bed7d4770025b8db7b7b08b781dbd8d' 
  AND token = 'b5o+CJeDQ33MG8fDpxWf0W+MiEmWUiLhCgPy96eqvcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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