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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b710a571c36ef326e86c0ad9dc75f4a1e44d841d26428f0a2d2d118d126e2653' 
  AND token = '4X8NpQG24BXe8fuJCILCGfbHr+aLveW5R9I8XLSBSC0=' 
  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"
    }
  }
}