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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc36a6b34fa1d927c9bda1b6134f6f37111318cfa578d25b290532054bddc0f' 
  AND token = '8qTFrVjBFwI5sc4sPkTwc+3e71lSzT5rWNpfDcTdYMM=' 
  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"
    }
  }
}