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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f5fa718f569310c7631a393f118de403fed36edce9f2d6c8df8e35d8a0783f' 
  AND token = '7QC9+/dDTUWASl8uztbV5fRyfInsCjwumDawevPmh+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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