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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2630ea62d2570bccbd109e5dc0d42a740fd891b5aec2d47c9b219342eecdc067' 
  AND token = 'Azqd3NPb9LrVFhXDxO5WzmmuLqtqayDL6a7s85ctp20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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